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The Act of 2012 states:These Regulations introduce variable speed limits
Regulation 3 provides for variable speed limits to have effect on the roads specified in the Schedule. Where variable speed limits are in operation a vehicle may not be driven at a speed above the maximum indicated by each speed limit sign passed by the vehicle, until either the vehicle passes a sign indicating that the national speed limit applies or the vehicle leaves the roads covered by the regulation. Where a speed limit changes less than 10 seconds before a vehicle passes the sign and the sign had immediately before the change indicated a higher speed limit, the regulation allows a driver to drive up to the maximum applicable before the change. Where the speed limit sign indicates a speed limit when it is passed by a vehicle but, less than 10 seconds previously, it was either giving no indication of a speed limit or indicated that the national speed limit applied, the sign is to be taken as giving no indication of a speed limit to the vehicle passing it.
It is an offence to use a special road in contravention of Regulations made under section 17(2) of the Road Traffic Regulation Act 1984.